218 Hohart Toivn considered with 



roughly squared ; and several of these works disposed like 

 hastions at the angles of an area, in such order as flank each 

 other, and connected hy a stockade, as a curtain loopholed 

 for musketry, form no despicable strength." He speaks 

 also of their being strengthened against Artillery by 

 interior traverses of earth. 



Block-houses are, I would submit, the closed works to be 

 used, — as at Sandy Bay Point (or rather above it), one of 

 the American build, in rear of the Town, — as at the top 

 of Davey-street, &c. ; others of a simple kind, varying in 

 strength, with the value of the position or its liability to 

 attack. 



The materials are at hand, and the inhabitants used to 

 the construction of timbered edifices, — substantial reasons 

 for their adoption. 



But in case it should be thought advisable to erect at certain 

 points Martello Towers, I append a description (and drawing, 

 Plate IV., fig. 91.) of one which may prove useful. 



The E. M. College text-book says, they are '' buildings 

 of masonry, generally circular, (Plate IV., figs, n op), 

 from 20 to 140 feet diameter and from 30 to 50 feet high : 

 sometimes they stand alone, and at others they are sur- 

 rounded with a ditch and simple glacis. They generally 

 consist of two stories, of which the upper one is shell 

 proof, and is pierced with embrasures and loopholes ; the 

 lower one is used as a store. The roof is surrounded by a 

 parapet, and a gun on a traversing platform is placed 

 thereon for the purpose of firing in every direction." 



The batteries near the sea-shore, as at Macquarie Point, 

 Battery Point, &c., may be constructed somewhat similar 

 to the work in Plate IL, fig. a. ; their faces are traced, of 

 course, at right angles to the intended line of fire ; or should 

 this be impracticable, then the embrasures must be traced 



